Fusible link



H. M. NACEYL FUSIBLE LINK. APPLICATION FILED MAY 9, 1919.

Patented Dec. 21, 1920.

PATENT OFFICE.

HARRY Ivr. NACEY, or onrcaeo, ILLINOIS.

FUSIBLE LINK.

Application filed May 9, 1919.

To all whom it may concern:

Be it known that I, HARRY M. NAGEY, citizen of the United States, and a resident of 927 South State street, Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improve ments in Fusible Links, of which the fol lowing is a full, clear, and exact specification.

This invention relates to improvements in fusible links designed for use in connection with automatic sprinkler heads for automatic sprinkling systems, and also for fire-proof doors, shutters or windows for retaining them in an open position, the members of which links are connected by solder, on the melting of which they are forcibly separated from either endwise compression or a pulling force, as may be.

The object of my invention is to provlde, intermediate the soldered plate members of a fusible link, means for reducing to a nummum dragging friction between the two plates otherwise produced on their separation from being pushed or pulled apart, as may be, on the melting of the solder, and by means of which their complete separation is promoted and quickened.

More specifically stated, the object of my invention is to provide a fusible link with contacting rollers interposed between the plates adapted to roll one upon the other, and thereby prevent the frictional drag of the plates and quicken their separation.

l/Vith these ends in view, my invention finds embodiment in certain features of novelty in the construction, combination and arrangement of parts by which the said objects and certain other objects are attalned, all as hereinafter fully described with reference to the accompanying drawings, and more particularly pointed out in the claims.

In said drawings:

Figure 1 is a longitudinal section of'a fusible link embodying my invention, taken on the line 1 1 of Figs. 2 and 3.

Figs. 2 and 3 are plan views of the plates detachechsimilar characters of reference indicating the same parts in the several figures of the drawings.

5 and 6 respectively indicate two separate plates, which as usual are preferably Specification of Letters Patent.

Serial No. 296,037.

formed from sheet phosphor bronze, brass or steel, arranged one upon the other as shown in Fig. 1, each being provided opposite the other at their ends with slots, 7 and 8, for connecting-them in their operative position with the struts of automatic sprinkler heads, fire-proof doors, shutters, windows, et cetera, each of which'plates is provided with recesses, 9 and 10, struck on the arc of a circle, of which the recess, 9, is of lessdepth than the recess, 10, as clearly shown in Fig. 1.- s

The recesses so formed providefor adjacent tubular chambers in open communication with each other, the ends of which are closed and adaptedto confine the rollers or rods, 11 and 12, so that a line, 13, drawn through the axes of the rollers extends at an angle inclined with reference to the plane of the opposing surfaces of the plates, 5 and 6, and that a tangential line, 14, will extend in a plane at right angles to the line, 18. The rollers or round rods, 11 and 12, are in direct contact with each other and of a diameter slightly less than that of the cylindrical chambers in which they are respectively confined, the plates being secured together by a film of solder and a thinner film of solder between the rollers and the opposing surfaces of the plates following the common practice of sweating the plates together, and as a result of which the rollers are hermetically sealed within the plates and free from any atmospheric influences tending to promote corrosion.

But my invention also includes the employment of plates separated by pushing force following the melting of the solder, for obviously in the presence of either of these forces it will now be seen that directed longitudinally of the plates, both the plates will simultaneously ride upon the rods and concurrently therewith be forced outwardly, the one plate from the other. The cylindrical forms of the chambers and rods serve to reduce the frictional drag of the plates to a minimum, if not to prevent its occurrence, and accordingly quicken the complete separation of the plates, which separation is materially promoted from the fact that a rolling contact is established between the rods immediately following the melting of Patented Dec. 21,1920.

the solder, and which increases the leverage exerted by the rods for quickening and separating the plates.

Having described my invention what I claim and desire to secure by Letters Patent is:

1. A fusible link comprising opposing plates, having communicating cylindrical chambers, a roller or rod for and confined plates, fusible means for connecting said plates, the inner opposing surfaces of each of which plates is provided with adjacent deep and shallow partially cylindrical recesses, the deeper recess in the one plate being opposed tothe shallower recess-in the other plate, and together forming cylindrical chambers in open communication with each other, and contacting rollers respectively confined in said recesses in such a position that a line passed through their points of contact and axes extends at an oblique angle to the plane of the flat surfaces of said plates.

4. A fusible link comprising two plates provided with opposing flat surfaces, one end of each of which platesextends beyond the other, said plates being respectively provided with adjacent partially cylindrical cavities, the one deeper than the other, the deeper cavity in the one plate opposing the shallower cavity in the other, and having their ends closed, rollers in each of said cavities arranged in contact with each other and so dis )osed that a line assin throu h D V D their axes and points of contact extends at an oblique angle to the plane of the plates, said plates and rollers being sweated together in their operative position with a solder of the required temperature.

In witness whereof I have hereunto set my hand and affixed my seal this 30th day of April, A. D. 1919.

HARRY M. NAGEY. [L.s.

Witnesses:

MABEL RA'rz, JNo. G. ELLIOTT. 

